Remove link to gitter from site footer

This option to "Discuss Source Code" is rarely used and not monitored.

config/_default/params.toml

@@ -8,8 +8,6 @@ ghrepo = "https://github.com/gohugoio/hugoDocs/"
 github_repo = "https://github.com/gohugoio/hugo/issues/new"
 ### Edit content repo (set to automatically enter "edit" mode; this is good for "improve this page" links)
 ghdocsrepo = "https://github.com/gohugoio/hugoDocs/tree/master/docs"
-## Gitter URL
-gitter = "https://gitter.im/spf13/hugo"
 ## Discuss Forum URL
 forum = "https://discourse.gohugo.io/"
 ## Google Tag Manager
@@ -20,4 +18,4 @@ images = ["images/gohugoio-card.png"]
 
 flex_box_interior_classes = "flex-auto w-100 w-40-l mr3 mb3 bg-white ba b--moon-gray nested-copy-line-height"
 
-#sidebar_direction = "sidebar_left"
+#sidebar_direction = "sidebar_left"